Back to all work
Utility Drawing Symbol Detection
Two-stage YOLOv8 vision pipeline that finds every legend symbol across dense utility drawings.
The challenge
Engineers hunt for every legend symbol across dense, multi-page utility drawings by hand. A single full-page detector throws too many false positives to trust.
What we built
A vision pipeline converts PDFs to high-res images, then runs YOLOv8 in two stages: first find the legend table, then pull each symbol inside it. EasyOCR and Tesseract label the symbols, and multi-scale template matching marks every occurrence on the map pages. It all runs in a Streamlit app, GPU-accelerated via Docker on RunPod.
The result
Upload a PDF, download color-coded marked maps and a duplicate-legend report, nothing to install. The two-stage approach is far more reliable than a single pass.